add yml key for drc decks, add hook to turn off false rules for Pegasus DRC

[jimfangx]

Adds 2 things:

• Add ability for users to specify their DRC deck via sky130_drc_decks: ["", "", ...] in tech-sky130.yml (one string containing path to deck for each deck) - it'll be added to the specific tool's drc_decks list automatically given vlsi.core.drc_tool is set in the tools.yml
  • corresponding tech yml is here: https://github.com/jimfangx/barduino-vlsi/blob/26184e72223ceb2e8631cebbd0d2f6fcb7a07dd0/vlsi/tech-sky130-inst.yml#L24-L26
• Add hook for pegasus decks to turn false rules off. -- If you are using the Cadence DRC Deck sky130_rev_0.0_2.3, Cadence included a .cfg to turn off false rules - this typically has to be loaded via the GUI but this hook inserts the flags into pegasusdrcctl and turns the false rules off.
  • if FALSEOFF is defined, the rules are turned off

Related PRs / Issues

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• Change to core Hammer
• Change to a Hammer plugin
• Other

Contributor Checklist:

• Did you set master as the base branch?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you update the poetry.lock file if you updated the requirements in pyproject.toml?
• (If applicable) Did you add a unit test demonstrating the PR?
• (If applicable) Did you run this through the e2e integration tests?
• (If applicable) Did you update the submodules in e2e/ if this feature depends on updated plugins?

[elamdf]

can you set a default in defaults?

[elamdf]

this is probably fine

[elamdf]

LGTM- can you include a comment on the 'false rules' addition in the PR title / merge commit before merging?

[jimfangx]

LGTM- can you include a comment on the 'false rules' addition in the PR title / merge commit before merging?

updated in the original PR comment + edited title